Arid
DOI10.1007/s10040-010-0644-7
Determining groundwater degradation from irrigation in desert-marginal northern China
O Dochartaigh, Brighid E.1; MacDonald, Alan M.1; Darling, William G.2; Hughes, Andrew G.3; Li, Jin X.4; Shi, Li A.5
通讯作者O Dochartaigh, Brighid E.
来源期刊HYDROGEOLOGY JOURNAL
ISSN1431-2174
EISSN1435-0157
出版年2010
卷号18期号:8页码:1939-1952
英文摘要

Groundwater degradation from irrigated agriculture is of concern in semi-arid northern China. Data-scarcity often means the causes and extent of problems are not fully understood. An irrigated area in Inner Mongolia was studied, where abstraction from an unconfined Quaternary aquifer has increased threefold over 20 years to 20 million m(3)/year; groundwater levels are falling at up to 0.5 m/year; and groundwater is increasingly mineralised (TDS increase from 400 to 700-1,900 mg/L), with nitrate concentrations up to 137 mg/L N. Residence-time (chlorofluorocarbons), stable-isotope and hydrogeochemical indicators helped develop a conceptual model of groundwater system evolution, demonstrating a direct relationship between modern water proportion and the degree of groundwater mineralisation, indicating that irrigation-water recycling is reducing groundwater quality. The investigations suggest that before irrigation development, active recharge to the aquifer from wadis significantly exceeded groundwater inflow from nearby mountains, previously held to be the main groundwater input. Away from active wadis, groundwater is older with a probable pre-Holocene component. Proof-of-concept groundwater modelling supports geochemical evidence, indicating the importance of wadi recharge and irrigation return flows. Engineering works protecting the irrigated area from flooding have reduced good quality recharge; active recharge is now dominated by irrigation returns, which are degrading the aquifer.


英文关键词Arid regions Irrigation Groundwater age Hydrochemistry China
类型Article
语种英语
国家Scotland ; England ; Peoples R China
收录类别SCI-E
WOS记录号WOS:000284599200014
WOS关键词NORTHWESTERN CHINA ; AQUIFER ; PLAIN ; SYSTEM ; BASIN ; RESOURCES ; RECHARGE ; FLOW
WOS类目Geosciences, Multidisciplinary ; Water Resources
WOS研究方向Geology ; Water Resources
来源机构中国科学院西北生态环境资源研究院
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/164495
作者单位1.British Geol Survey, Edinburgh EH9 3LA, Midlothian, Scotland;
2.British Geol Survey, Wallingford OX10 8BB, Oxon, England;
3.British Geol Survey, Kingsley Dunham Ctr, Keyworth NG12 5GG, Notts, England;
4.Cold & Arid Reg Environm & Engn Res Inst, Div Hydrol & Water Land Resources, Lanzhou 730000, Gansu, Peoples R China;
5.Alxa League AusAID Project Management Off, Bayanhot 750306, Inner Mongolia, Peoples R China
推荐引用方式
GB/T 7714
O Dochartaigh, Brighid E.,MacDonald, Alan M.,Darling, William G.,et al. Determining groundwater degradation from irrigation in desert-marginal northern China[J]. 中国科学院西北生态环境资源研究院,2010,18(8):1939-1952.
APA O Dochartaigh, Brighid E.,MacDonald, Alan M.,Darling, William G.,Hughes, Andrew G.,Li, Jin X.,&Shi, Li A..(2010).Determining groundwater degradation from irrigation in desert-marginal northern China.HYDROGEOLOGY JOURNAL,18(8),1939-1952.
MLA O Dochartaigh, Brighid E.,et al."Determining groundwater degradation from irrigation in desert-marginal northern China".HYDROGEOLOGY JOURNAL 18.8(2010):1939-1952.
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